Rotary grizzly screen



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Aug. 7, 192s. 1,679,593

H. C. WILLIAMSON ET AL ROTARY GRI Z ZLY SCREEN WTNESS BY M @y Arron/vers Patented Aug. 7, 1928.

HERBERT C. WILLIAMSON AND BUFORD M. STUBBLEFIELD, Y'UNGSTOWN, OHIO.-

.ROTARY GRIZZLY SCREEN.

Application filed Api-i129, 1927. Serial No. 187,460.

Our invention relates more particularly to that class of screening devices known as grizzly screens and which are in common use in These screens comprise a various industries. plurality of spaced parallel shafts on each of which is mounted a plurality of disks which, taken as a whole, form a bed over which the material to be screened is gradually carried as the shafts are rotated.

It has heretofore been usual to form each disk as a solid integral unit and to provide it with a central aperture for the passage of shaft on which it. is to be disposed. vThe disks are then assembled on their respective shafts by. slipping them one at a time over Vthe end of the latter until the requisite number have been placed thereon and are then secured in position by suitable means opera-r l tive to prevent them `from moving `longitufill fifi

dinally on the shaft. To insure the rotation of the disks in correspondence with the shaft the latter is frequently squared andthe apertures in the disks'correspondingly formed, or other suitable lmeans employed to bring about this result.k

This method 4offforniing and assembling the disks' on theshaftsis open to the disad,

vantage, among others, that if at anytime it is desired to removeone of the disks and replace` it with a new one it is necessary to first unlock or remove the means by which V the disks are held endwise on the shaft and to then take olf all ofthe disks which lie bev l elusive and the second in the reina'ining'figtween the end of the shaft and the disk which is toA be replaced before the latter can be removed. -into position along the shaft all of the other disksvwliich have been removed must be like- Similarly, after the new disk isslid wise replaced one at a time 'and the locking means then secured in position, all of which requires av considerable expendituieof time A and labor as well as the risk of breaking some' of the disks during the process of removing and replacing them on theA shaft.

Additionally, it is frequently necessary tov remove the shaft from its bearings in the machine so as to permit the disks to be slid off the end of the shaft. Thus, not only does the actual labor cost of replacing a worn or broken disk amount to a considerableitem butthe time during which themachine is necessarily kept idle for that purpose materially reduces its maximum productive capacity. v f

An object of our invention therefore is to overcome the aforesaid disadvantages which are inherent in the use of solid disks byl providing disks which may be readily initially assembled on the shaft even though the latter be disposed in its' bearings, and which may' thereafter be individually or selectively removed and replaced without the necessity of removing any of the-other disks in the assembly and, yin fact, .without the necessity of Acertain forms of our invention as illustrated in the accompanyingdrawings.

Generally speaking our invention comprehends the formation of each disk in two similar complementary parts separable on a diaineter of tlie disks andthe provision of means operative to temporarily hold the disks on the shaft as they are being initially lassembled tliereonor whenone or more disks are being removed and replaced from thek assembly in association with means adapted to force the disks longitudinally together so as to' permanently maintain them in operativelyassembled relation as will hereinafter be more fully explained.v Y

lIn vthe accompanying drawings we have shown two slightly different embodiments of our invention, the first in Figs. l to 5 inures. More particularly, Fig. l is a somewhat fragmentary view of two adjacent shafts ofv a grizzly sereenremo'ved from the rest ofthe machine and each carrying a plurality of our improved disks in operatively assembledposition, portions of certain of the disks being vbroken away to more clearly illustrate details offconstruction; Fig. 2 is an enlarged end viewof one of the disks removed from the shaft, Fig. 3 is a side view vthereof-partially broken away to the plane 2; Fig. 4 is an en-.

ofthe line'3*3 in Fig. lai-ged end view of one of the collarsV employed at each end of the series of disks on the shaft, and Fig. 5 is a side view of `the collar partially broken` away into central seetion. Figs. 6 to 8 inclusive, illustrate as stated ak slightly different formrof theinvention and respectively generally correspond to Figs. 1 to 3 inclusive. Figs. 9 and 10 and Figs. 11 and 12, respectively generally correspending'l to Figs.- 4 and 5,.respectively illusfill trate the two types of end'collars adapted for employment in this formV of' the inven-l tion. The same numerals are used to designate correspending parts in the several figures.

Referring now more particularly to that form of the invention shown in Figs. 1 to 5 inclusive it is to be vprimarily understood that all of the disks are of similar construction and that many of them may be disposed on each shaft asmay be desired in accoi-dance with the particular size and re-y quirements `of the screen. The shafts l on which the disks 2 are supported are usually arranged in parallel relation and will generally be of circular cross section at their extremities to facilitate their support in suitable bearings (not shown). rlhe central portion of each shaft, however, in the region in which the disks are disposed, may preferably be of square cross section with its corners-slightly chamfered oli' and the central apertures of the disks are arranged to conform thereto and form a snug fit thereon.

Each disk comprises two similar complen'ientary halves or sections,y separable on a plane coincident with a diameter of the disk, and which when placed together form the complete disk. rllie latter considered as a whole comprises a central hub 3 having end faces a, t, and a peripheral flange 5 disposed equidistantly therefrom and, as hitherto stated, is provided with a transversely yextending aperture G at its center conforming in shape and size to the squared region of the shaft so that the latter can extend snugly through it; conveniently the` plane of division or separation bet veen the sections, as indicated by the line 3 3 in Fig. 2, may 'l end at right angles to one of the flattened s of the aperture G.,

For the purpose of holding` the sections of the several disks temporarily together as they are beingassembled on the shaft as well for holding them in mutlilally locked relation after assembly, we provide each disk with means adapted to interengage corresponding means on the adjacent disks in such. manner that the disk sections will be held together as they are progressively ap plied to the shaft during assembly thereon and will also, through the operation of any suitable locking means adapted to crowd the Y lisks longitudinally together after they are assembled on the shaft, be locked together so Las to Yform an operative non-relatively movable unit. Y

lVhile said means may partake of various forms a satisfactorily operative embodiment thereof may comprise,` as shown in the particular form of the invention to which reference is now being` made, a rib 7 extending dian'ictrically across the face l at each end of the hub 3 of the disk and projecting outwardly therefrom, the cross sectional contour of the rib preferably conforming to the vertical section of a truncated pyramid. Preferably these ribs are disposed symmetrically with respect to the plane of separa-v tion of the sections of the disk so that onehalf of each rib will lie on eachside of the said plane when the sections are placed together. For the reception of the ribs on the adjacent disks, each disk is also provided with a pair of diametrically extending grooves 8, 8 respectively formed in the hnd faces l, l of the hub and disposed at right angles to the ribs 7, 7, the grooves of course corresponding to the ribs in cross sectional form and size. p

Any suitable means are also provided for forcing the disks longitudinally together after assembly on the shaft, for example, keys l0, l0 respectively adapted to be received in slots cut through the center of the shaft adjacent each end of the series of disks, each slot and each key having an inclined f' ce or wall adapted for mutual cooperation in such manner that when the keys are driven into the slots they will exert a Wedging action inwardly in opposite directions on the series of disks disposed between them. rlhe keys may be held in adjusted position by set screws ll or in any other suitable way.

'lo provide a suitable bearing at each end of the series of disks for the key or other means by which the disks are crowded together and locked into position` we may utilize a solid collar, generally designated as l2, and best shown in Figs. l and 5. Each of t e collars may have its inner face, that y the face which is intended to lie next to the disks, provid'edwith a diametrically eX- tending rib 7 similar to the rib Ton the disk.`| and with a diametrical groove 8 disposed at right angles to the rib 7 and also similar to the grooves 8, while its outer face l-l may be plane, the collar of course being provided with a central squared aperture 14 similar to the aperture 6 and adapted to receive the squared port-ion of the shaft.

Villen constructeril substantially in the mannerdescribed, the disks may be conveniently assembled in the shaft ,as follows, although other methods may be vemployed if desired: One of the collars l2 is first slipped over the end of the-shaft with its ribbed face directed inwardly and slid along the shaft until its outer or plane face 9 passes the slot provided for the reception of the key.; the latter is the-n inserted and temporarily secured in place so as to form a backing` for the collar. The two sectionsrof the first disk are then placed on opposite sides of the shaft, brought together about the same clear of the collar and then slid slightly along the shaft towardL the collar until the ribs on the latter are seated in the groove in the adjacent face of the disk and theribs on the disk correspondingly seated in the Ll l) and a series of disks disposed thereon, each oi said disks being formed oil a pair of similar complementary sections the plane oi' separation between the sections coinciding with a diameter of the disk, and means on the end faces ot each disk inter-engaging complementary means on the end races or the adjacent disks to hold the sections et the disk together on the shaft, the planes oI separation of the sections of adjacent disks being disposed at right angles to each other.

3. In a grizzly screen or the like, a shaft and a series ot disks disposed thereon, each disk in the series being 'formed in two similar complementary sections separable on a plane coincident with the diameter oin the disk andthe end faces et each disk being provided vwith inter-engaging means respectively cooperative with complementary means onthe adjacent disks to hold the sections or' the disks together on the shaft when the disks are thereon arranged with the planes o' separation between the sections of adjacent disks disposed at right angles te each other, and means operative to crowd the disks longitudinally together in assembled relation.

e. In a grizzly screen or the like, a squared shaft and a series of disks disposed thereon, each ot' the disks in the series comprising a pair el' similar complementary sections separable on a plane coincident with a diameter of the disk and having on its end laces means adapted for inter-engagement with complementary means on the adjacent disks to hold the sections ot the disks together on the shatt as they are progressively assembled thereon with the planes of separation of the sections of the disks arranged alternately at right angles to each other, a collar at each end of the series of disks having means on its inner face cooperative with the inter-engaging means on the end o'l the adjacent disk, and means exterior of the collars operable to crowd the collars and disks together longitudinally.

5. A grizzly screen disk having a hub apertured for the passage of a shaft, a peripheral flange extending from the hub and means on the ends of the hub respectively adapted for inter-engagement with complementary means on the adjacent disks, said disks being formed in two sections separable on a plane coincident with a diameter thereof. Y

6. A grizzly screen disk comprising `two similar complementary sections which when placed together form the complete disk and having a hub apertured for the passage of a shatt and means on each end face or' the hub adapted to inter-engage with complementary means on the hubs ot adjacent disks and operative when so engaged to hold the sections oi' the disks together when the plane of division between said sections is disposed at right angles to the planes of division ot the adjacent disks.

7. il grizzly screen disk formed in two similar, separable complementary halves and comprising` an apertnred hub, a diametrically extending rib on each end tace of the hub and a diametrically extending gfroove in each said end tace disposed at right angles to the rib and conforming in cross |sectional contour thereto.

S. A grizzly screen disk formed in two similar, separable complementary halves and comprising an apertured hub, a diametrically extending rib on each end tace of the hub divided longitudinally by the plane of separation between the halves e'f the disk and a diametrically extending groove in each said end liace disposed at right angles to said rib.

9. A grizzly screen disk formed in two similar, separable complementary halves and comprising an apertured hub, a diametrically extending rib en each end face ofthe hub in cross section approximating the vertical section of a truncated pyramid, the center line et said rib coinciding with the plane of separation of the halves of the disk,

and a diamertically extending groove formed in each said end face extending at right angles to the rib and conforming in cross section thereto.

In witness whereof, we have hereunto set our hands this 27th day of April, 1927.

HERBERT C. INILLIAMSON.. BUFORD M. STUBBLEFIELD. 

